I got my first Hyundai ( a Sonata) in 2017. It had one complex issue in the time I had it. Hyundai honored the warranty perfectly in all respects, and even though the repair took weeks, rented a car for me the entire time. I was happy enough with the dealer and the car to lease another one this year. If you don’t trust your dealer to provide proper warranty service, take it to a different Hyundai dealer. If you try to DIY this, you risk voiding your warranty.